Re: Apache Children Stuck on futex
Torsten Förtsch <[email protected]>
| Newsgroups | gmane.comp.apache.mod-perl |
|---|---|
| Message-ID | <[email protected]> |
On Wednesday, 26 October 2011 05:56:49 Max Barry wrote:
> $ strace -p 24133
> Process 24133 attached - interrupt to quit
> read(5, "!", 1) = 1
> tgkill(24133, 24164, SIGHUP) = 0
> tgkill(24133, 24164, SIG_0) = 0
> --- SIGTERM (Terminated) @ 0 (0) ---
> rt_sigreturn(0xf) = 0
> select(0, NULL, NULL, NULL, {0, 500000}) = 0 (Timeout)
> tgkill(24133, 24140, SIGUSR1) = 0
> futex(0x7f9904f4e9d0, FUTEX_WAIT, 24140, NULL
It would be interesting to see which futex it is blocked on. One way to
check that is perhaps to allow core dumps in the apache config and then
to send a core dump signal like SEGV, BUS or similar when the process
hangs. Use the dump file then to get a stack trace.
Torsten Förtsch
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